I am really excited about a free resource for learning. I believe there should always be a free resource for learning. People can always go to college and get certified for the field of their interest. Khan Academy is providing an invaluable resource.
I am a college graduate and I am thinking about taking the exam required to become a math teacher in California. I was looking at the guides and I am really excited. Very nicely done and well covered from what I can tell. Through your website and many other resources I have been able to study and determine if teaching Math is for me. No waste of large sums of money and no getting in college debt. People can make informed decisions on their fields of interest and prepare.
Definitely will have my donation next month (july). Keep up the excellent work. Education as a resource should always be free. :)